A correct format should be followed for writing a formal letter. Formal letter should be correct in format from start of the letter to end. Your letter if wrongly written then there is chance of your letter been rejected.
Special attention should be given while ending the letter. The gist of the letter is included at the end of the letter so care should be taken while writing the letter. Every formal letter has its own ending.
For example request letter can be ended with, “I request you to reply for the same” or “Kindly oblige us by replying to the letter”
“Thanking you” or Yours Sincerely” or “Yours faithfully” or Warm Regards, is written towards the end below which is written the name of the person writing the letter.